Sometimes I get interrupted while programming and would like to have some sort of alarm function that can remind me to do sometihing important.
I do not want to build a clock, nor do I want the kind of thing my smartphone does.
Just an on-screen reminder would be best. Non-recurring. I know there used to be a program called reminder that would do this. I also know about sticky-notes but have a policy of never changing my repositories for any reason. Also there is one called something like remindor but it won't work with 16.04 LTS.
So now I can't locate anything similar.
Maybe someone in the community knows this.
How can I make my Ubuntu do this easily? Hopefully with just a single command (because this is usually in response to a phone call for help elsewhere).
---EDIT: I had to actually install the at command on Ubuntu 16.04 LTS:
sudo aptitude install at